JPS62167403A - X-ray inspecting instrument for tire - Google Patents

Abstract

PURPOSE:To obtain an instrument provided with a thickness correcting material for automatically following the configuration of a tread even when a tire is rotated by immersing the inspected portion of the tire in a liquid with an X-ray transmittance approximate to that of the tire. CONSTITUTION:A mechanism for rotating four holding shafts 12 is provided in a rotationally suspending apparatus 11 having the four holding shafts 12. Two flanges are formed near the distal end of each holding shaft 12 to position a tire 50 in the direction of its width. A water tank 15 with a bottom made of a material having a good X-ray transmittance is disposed below the tire 50 and can be vertically moved in accordance with the diameter of the tire 50. The lower portion 51 of the tire 50 is immersed in a liquid, for example water, with an X-ray transmittance approximate to that of the tire 50 in the liquid tank 15. A semicircular metallic supporter is mounted with an X-ray generator 21 for radiating X-rays to its top and an X-ray receiver 22 for receiving a transmissive image to its bottom. Therefore, the intensities of the X-rays that transmit the groove portions and the crest portions of the tread are substantially equal to each other in the receiver 22 and, even when the tire 50 is rotated, water gets in the lower tread, enabling the whole circumference of the tire 50 to be smoothly inspected.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a tire X-ray inspection device for inspecting the internal condition of a tire using X-ray fluoroscopy.

X-rays are used to examine the internal conditions of various products.
When a substance passes through a substance with a constant transmittance, the amount of transmission decreases in inverse proportion to the power of its thickness.

In other words, a small difference in thickness results in a large difference in the amount of transmission. While this property makes it easier to detect slight differences in thickness, it also means that when inspecting products with large differences in thickness, the amount of X-ray irradiation must be adjusted according to the thickness of the area being inspected. . Therefore, when inspecting products with large differences in thickness using an X-ray television camera, a thickness correction material called a mask is placed over the thinner parts to minimize changes in thickness during observation.

■ is about to start. Except for special tires, most tires have grooves carved into the contact surface called the tread. If the X-ray dose is adjusted according to the ridges of the tread, the amount of X-rays transmitted through the grooves will be large and cause halation, making it difficult to see.
When the dose is adjusted, the mountain becomes darker and harder to see. Therefore, it is sufficient to inspect by layering the correction material, but in the case of tire treads, the grooves have a complicated shape, and the entire circumference must be inspected, so it is necessary to inspect the thickness correction material. It was difficult to manufacture. For this reason, images were taken using an X-ray photography device with a wider latitude than an X-ray television camera, or the X-ray dose was adjusted, or unsatisfactory examinations were performed in which parts that could not be clearly seen were left unsatisfied.

The present invention was invented to solve the above problems, and provides a tire X-ray inspection device equipped with a thickness correction material that automatically follows the shape of the tread even when the tire is rotated. It is an object.

. A tire X-ray inspection device of the present invention includes a rotating suspension device, a liquid tank, an X-ray generator, and an X-ray image receiver.

Operation - While the tire is held in a vertical position by a rotating suspension system, the lower tread portion is immersed in the liquid in the liquid tank and rotated.

The X-rays from the X-ray generator pass through three areas: the tread at the bottom of the tire, the liquid in the liquid tank, and the bottom of the tank, and the transmitted image reaches the X-ray receiver. At this time, the X-rays that pass through the grooves of the tread are attenuated by the thick layer of liquid and reach the X-ray image receiving device, and the X-rays that pass through the peaks pass through the thin part of the liquid layer, so they are mostly attenuated by the liquid. It reaches the X-ray image receiving device without any problems.

11 bases FIG. 1 is a schematic diagram showing an embodiment of the present invention.

In the figure, there are four horizontally protruding holding shafts (lower two
A mechanism for rotating the holding shaft 12 is provided inside the rotary suspension device 11 having a rotary suspension device 12 (some parts of which are omitted). Two flange portions 13 are formed near the tip of the holding shaft 12, and by entering the flange portions 13 inside the vertically suspended tire 50, the tire 50 is positioned in the width direction. A liquid tank 15 whose bottom surface is made of a material with good X-ray transparency, such as carbon resin, is placed below the tire 50, and this liquid tank 15 moves up and down according to the diameter of the tire 50 to be inspected. I can make things happen. The lower part 51 of the tire 50 is immersed in a liquid 16, such as water, which is filled in a liquid tank 15 and has an X-ray transmittance similar to that of the tire. At the upper end of the semicircular support fitting 23, there is an X-ray generator 21 that irradiates X-rays from the inner peripheral part of the tire 50 toward the lower part 51, and at the lower end there is an X-ray receiver 22 that receives a transmitted image, for example. An X-ray television camera is installed. The support fitting 23 is supported by a support mechanism 26 so that it can be moved along the circumferential direction when the tire 50 is replaced and can be moved up and down when the diameter of the tire 50 is changed.

FIG. 2 is a schematic cross-sectional view showing the relationship between the tire 50 and the liquid tank 15. The lower part 51 of the tire 50, which is vertically suspended by the holding shaft 12, is immersed in water 16 in the liquid tank 15. A water level adjustment damper 31 is provided in the liquid tank 15,
When the water level exceeds the upper surface 32, the water level in the liquid tank 15 is kept constant by letting 7 and 16 escape to the outside. Since the depth hl of the water in the liquid tank 15 changes in accordance with the depth of the tread of the tire 50, the water level adjustment damper 31 can be moved up and down.

Since water 16 is supplied to the liquid tank 15 from the supply port 33,
The water level in the bathtub 15 is always kept constant by the action of the water level adjustment damper 31.

FIG. 3 is a schematic cross-sectional view showing details of the lower part 51 of the tire 50. X-rays 61 passing through the groove portion 53 of the tread are attenuated by the rubber layer having a thickness of h6 and the layer of water having a thickness of h4, and pass through the liquid tank 15. X passing through the tread mountain portion 52
The wire 62 passes through the liquid tank 15 attenuated by a layer of rubber having a thickness of h5 and a layer of water having a thickness of h3. The X-ray permeability of water is better than that of rubber, but there is no significant difference. Therefore, there is no significant difference between the strength of the X-rays 61 passing through the groove portions 53 of the tread and the strength of the X-rays passing through the mountain portions 62 when they reach the X-ray television camera 22. Furthermore, even when the tire is rotated by the rotary suspension device, water enters the grooves of the lower tread located at the portion to be inspected, so that inspection can be performed over the entire circumference of the tire without any problem.

Note that the present invention is not limited to the above-mentioned embodiment, and the number of holding shafts 12 can be changed to another number, for example, only two at the top.

By immersing the inspected part of the Tire in a liquid with an X-ray transmittance similar to that of the tire, we applied a thickness correction material that automatically follows the shape of the tread even when the tire is rotated. It becomes possible to provide a tire X-ray inspection device equipped with the following.

[Brief explanation of drawings]

Fig. 1 is a schematic diagram showing an embodiment of the present invention, Fig. 2 is a schematic cross-sectional diagram showing the relationship between the tire and the liquid tank, and Fig. 3 is a schematic cross-sectional diagram showing details of the lower part of the tire. . 11...Rotating suspension device, 15...Liquid tank, 21...X
ray generating device, 22... X-ray image receiving device. Patent Applicant Shimadzu Corporation Representative Patent Attorney Takaharu Ohnishi 11th Payment Agreement U Figure 1

Claims (1)

[Claims] (1) A rotary suspension device that holds the tire in a vertical position and rotates the tire, and a bottom surface made of a material with good X-ray transparency, and a lower part of the tire that is filled with a liquid having an X-ray transmittance similar to that of the tire. a liquid tank in which the tire is immersed; an X-ray generator that irradiates X-rays from an inner peripheral portion of the tire toward a lower part of the tire; A tire X-ray inspection device comprising: an image receiving device.